Which type of beneficiary can enroll in a Part D plan?

The correct choice highlights that a beneficiary who has just turned 65 and enrolled in Part B is eligible to enroll in a Part D plan. This is important because Part D is specifically designed for individuals who are eligible for Medicare, which typically includes those who are 65 and older or under 65 with certain disabilities.

When a beneficiary turns 65, they become eligible for Medicare Part A and Part B benefits. Enrolling in Part B is crucial because it establishes their eligibility to then enroll in a Part D plan, which provides prescription drug coverage.

This enrollment process is critical, as it allows newly eligible beneficiaries to select a Part D plan that suits their medication needs as they transition into Medicare. Understanding this connection between Medicare Part B enrollment and the ability to enroll in Part D is essential for anyone navigating the Medicare landscape.